<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <button onclick="getReq()">按钮</button>
    <script>
        function getReq(){
            const xhr= new XMLHttpRequest()
            xhr.open("GET","/users")
            xhr.send()
            xhr.onreadystatechange=function(res){
                if(res.readystate==4){
                    console.log(res)
                }
            }

        }
        

    </script>
    
</body>
</html>